Meaning of vest-pocket

vest-pock•et

Pronunciation: (vest'pok"it), [key]
— adj.
  1. designed to be carried in the pocket of the vest, in a purse, or in a similarly small space; miniature: a vest-pocket dictionary.
  2. very small: a vest-pocket version of Versailles.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.